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2008 Dec 08
10
[PATCH] Accurate vcpu weighting for credit scheduler
Hi,
This patch intends to accurate vcpu weighting
for CPU intensive job.
The reason of this problem is that
vcpu round-robin queue blocks large weight vcpus
by small weight vcpus.
For example, we assume following case on 2pcpu environment.
(with 4domains (each domain has 2vcpus))
dom1 vcpu0,1 w128 credit 4
dom2 vcpu0,1 w128 credit 4
dom3 vcpu0,1 w256 credit 8
dom4 vcpu0,1 w512 credit 15
d4v0 gets 15ms credit each time.
but if 3vcpus are blocking,(like d1v0, d2v0, d3v0)
d4v0 credit becomes over 30msec(45msec=15x3times).
Then d4v0 credit cleared.
This makes d4v0 uses smaller credit than e...